actually it was not off topic. i was told by pioneer the only difference between the z1, z2,and z3 was the maps. with that said you can find a z1 or z2 on ebay in great numbers. now the difference in the price is great. the z1 can go for 700 which is what i purchased mine for. the hard drive replacement is 140.00. the z2 are going for 1100. minimum and the z3 are even pricer. the hard drive converts the z1 to a z3. so this should have helped. just trying to give information to save you money or even find an easier way to get what you want faster. can someone please correct me if i am wrong or